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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1885793a0f083762967ee3fb2175960a481650fc395268349d72f47a41ba55df' 
  AND token = '7z03RrJO+FlGjgcferm/all0Q+0rEfQHZ0x3Yf055DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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