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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057dc2a7887a2ed65cf620ed5024e8f426d84a89a2a4e1442041e3a0ecfe9085' 
  AND token = 'WesjA2SUm5R8Wvuj7pHq4POMf4cO9noYp48a84tDK2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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