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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433aa5a058ed83c8e4f47a3675ec92523d97a6546b0921a2a195836bffc810a7' 
  AND token = 'fuo2Gy1uguPqbhj7MT+bGWUezty1p66SDoV2QoSaal4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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