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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553156c0ceb7bc38c5593f2b2a0b72334be32c3c26ed6d11391c0c0007133118' 
  AND token = '94ToPKRaKx6b9lbXks/RD9voon3ZANf/tFpYb63ngzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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