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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793feb3c0419984d11e097a88b0ade96ca8d673b3a33042ff951ce9fca616e1e' 
  AND token = 'zaiKSe/MuHBerMJau43yOV+IVgkkTqc31/4NltgzA9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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