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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f79430d6570a3ba799e5405773a6628ca67af8b61c5cb8305bb4c0b23cf19c7' 
  AND token = 'M4YSBl61WjpTdKwd7whdRbK8i5sPTgPkmhHBYgwD0Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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