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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ca4b04d301cc98cc54dff7a0216c354abadc3f33331234d7e183c4fd534b9c' 
  AND token = 'wWaH6R84EeYvddL50E7aK4SY/vPEe6aQNKyxTzmMVPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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