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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd336060e9be900f23d9043b75b6405eb76e508216d46237e05f0544277444bcf' 
  AND token = 'Bz2JrugS47EFmSUxj0TJL8ey7d+4S5O8ao8lhcqUO30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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