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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0d516bb3137cfd434b6e44234fcaa17ae890b039be6d33da173a12a30ff17c' 
  AND token = 'JxXgznLBZuvq7tDKU0CUFGev3nLy009pCY+fNi2BpEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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