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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514bf2efc2408a0d4b298400d1376f7eb84f7cb0c39b39f98879c3c4da58ec73' 
  AND token = 'dINhC0AMv0cb3Gay5sswAoGPGBvO1yWnfdSoSiFuCI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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