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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa72e52f198b53239c15da1710d70d5cdd8bbe336d8813e7f94e5e1392e7c64c' 
  AND token = 'G/phq5rmvIDyAw0wSldyVSWZ97Ys6PmwoOlfcsXmZXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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