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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63efcb511a81532ef3b7653e26cc30b5b3e3f4fc9fd4149a33ab386fc8a4019d' 
  AND token = '6y9JEicvqFjLXAnZdZu2vsR7ff0Kj3fHSRLJDKWVXi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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