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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfc090e3ca0b72ff6dcbe608b912a06fac1c60661edc46c8b25107b150cdbec' 
  AND token = 'asIyxJiLXwNVePjReR/etU+A9/+wkjSYZz8AR/WetKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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