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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098a444c968aceaf3d840c8381f2a2097ba23af12c5011d7acfa6d7ffa8e85df' 
  AND token = 'hY5j5SF6mjqsp4pemrTzXVj1IzxY1sDe3ymD6deo7Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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