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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d3435cbe2abdf91c18ab6d6df314cf49ae7f257d8e3aaebe6633700a16db5d' 
  AND token = 'ewa10DuBYnEzGWGUkjwhiHtNaCBop4uTIK3xknwmVYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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