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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fb829edc8b54dfee9ae4f5040dc8541e5ee83b62ffd3ca543d4c22843a8c67' 
  AND token = 'ln88sQBIM3PK1a2klL7yBujQKGJXDCBN0nVC6e2aEWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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