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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48fbd9f3bbd601ae28cc526aa16a0337f454a80fc9ab72e8c611e98824bc60fc' 
  AND token = 'BY7H3Z7LZOzCf1V1vRsdp1k3vtOovtzPGgC2U47EB+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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