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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7771a4717f767dfb75daf13cf506de651637ff1ecb86b0a676adde624e9951' 
  AND token = 'c9nR0Mho4aWN7VFti6xofpng0BihV4LG3W9S9F5qz1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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