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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9ade71fb8b2bd52e600c45ec9cc02e3a5e8c93e1aab0d6e7dfdcd2ee42b231' 
  AND token = 'zfPEy+ebmZaRNl9rZ9Ri0Fap5PHaq2LudWZoA9kOwZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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