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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3692c9547975477126172eb4855aa8447297d205de144ebf7ffd91a9fe4f199c' 
  AND token = '3VtOe4RoCZpPN+EW7WqHzayUyBPAANq7f0Z+Cj6jHPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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