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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1e4b7af0a3556496623da5e7379adadd9820d9537a185361c8aead7dd024de' 
  AND token = '2uSkGmByOV6LOmZG3zuCiSeaxFNZtPHpAHkm5gJReak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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