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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eca3f6e593c66fa82556ff384088298458caad932e88cd9e293f2643bac19ad' 
  AND token = 'v6p4T0/s18svWbIpx9p2m3Tb2uuX6sPL0VWuAuMOk6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}