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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2df08d8ec435df622088a9bbf667bd6bf1eca0fb28c68b9e06b8e206eb1395' 
  AND token = 'jXt6itj3Umx0eoctEqq+PK9dQM0InhIKJWWqwHIFVzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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