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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eabdee5d053f66324ebf12f08d4d296e46a924d0acb3f7c9f11833a0f937d23' 
  AND token = 'Ekkv96YVBHyvhrIAyzbcNo7n3NQaCxC0PoDYj7uD944=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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