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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9339a2d48b0c1ac262fa63dc2d0c62b8240ab34c879373f5cd1201cb9a3be6' 
  AND token = 'EQ8IfHaZRyAUDMotucPFgAfZnFeRd+8dtraqIHmJ2Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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