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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fe367d6f0181327b1b2a3ad2279ff52f7aa5a6f0c2fa8b6837d9635e305aed' 
  AND token = 'MFhZ1k7080qdLf+5tT+QY1bG+j3rWTmzvYqajLURolI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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