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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc364b8036dbd2ad392c618d71762c653a740103981d9751dc810aad6b980b0b' 
  AND token = 'a4aD4RFmJkOf9ls4eq22nwJThHQn7r+M5WLXcNlnEGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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