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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da25b462172b2a9f28a33fe603ba7ae6b30715a672a2e64f8a356320bd557c6' 
  AND token = 'VcxU4OwCghr4/B86Ai33XlyOIlb7no8dTVINEUab0w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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