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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05931ddc0740f47f23172406261e0675fd4a10b3afaa3985c5b9f35128a05aad' 
  AND token = '0BNquf0rdqXYv8a8N+XmCSinJBK++iTEEr1GL4LDpW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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