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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98306d046f57d374f74acf34ed7750971646e3bbbcc4c6803176d75273bf70d5' 
  AND token = 'dRCP+ULPLVjn3foHrl51K6EctCP6IfBoCRIfI4LMYCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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