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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facf2da39d721477ac914d5e3d2404d144d49b7c7d2e3d2adbbf89c648917519' 
  AND token = 'gpTlNlSdN0eASpObFKcK0JhKUMEzgH8y+Ulf1Nn1qEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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