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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab954076dfcbd874f9acd3a136c7263f4839be705b77cf5341ac180ac86f41d7' 
  AND token = 'DtwA86R6mohsFYzir8VCkIkw7JArE9mgp9wspOIvUlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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