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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f79bb7c78aa63dd19d80e2ab1e1389b076230496e7e6841a3c8f312ca3564d0' 
  AND token = 'XgkOph2hMpxbplwufuzlmO4XvDlLni2/Whoh6XY7dQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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