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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f995c4bf2a80a95f95381c5de199e0a41d9ad3cc3008538d71f387127c5b52' 
  AND token = 'KQkA6wXOiiqzM21GT2IPVqOIlfyi2YZs6OubbTyX7Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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