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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f1a1f8397ccb35bfbbcc4f3e2a5ee6e358f620a33789ed3a5e0df32a0dcf54' 
  AND token = 'lKTjLq6vui4a4DSAWdxLmZPDhmR68pYhVnXRdE1ujuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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