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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7e746351a6de2b70fcfe227fd9d5dc342d5fce09afd5e7d5ba2a81a12eebbf' 
  AND token = '6aUhGLORkPgCz21W37NvpLtnmRR3FVOsi2rDKnrg2SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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