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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df65347cfb7c93f2cf0f57a010de054a6754cd4e7872acb9edf861a23691a5b4' 
  AND token = 'pqqILAMPTk0AXYNrWI3nD7a/Bt5G6V037tQaFI6MW74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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