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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9e9039f155e2f0be27d5285dbefe9b395ae67fa58e72e0d3c602b12a6c687f' 
  AND token = 'KBDmaf9+GYNn69ZHIuW1L9bcQwGCZ+OCQ9Al+66hhz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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