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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3a03e5ebdaeb2bfae1ae61d511b8c8aa9ab5f9f02c3ff7e3129127c0b8eb96' 
  AND token = 'bhPcBqyoGpEiRoJhBvgRGw2ZnryYtEniARQwfxXyvk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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