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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455bea6923bef47acc734fb448fbbbeb183371235abc41355f398a84c263b5b3' 
  AND token = 'FInac6d8ob5w7bDZNayLj6juiNcw9g3v4X3gVRsmQr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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