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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4cf929d774f440543c9f15c85664646c2286915f96bde3e676c4fe9bff1b2c' 
  AND token = 'T3r7EsgMbL7EtbUnry/oqLSdWYumi4jK82GRZIT1OHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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