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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81d166a80f2184a08a26dec34ba9b2e821376d2a31dfb7974db5697b33e23bd' 
  AND token = '/pc4yqnjqXF1cGQffhSPzC8dW0yk6iTfesjjXD70aYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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