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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b70a1467b9752c01398ac8e707aa46bc22c9d3c2e4bb30a0372148d4417e8e5' 
  AND token = 'GPsbRfzKHzTaGHuwQUIMC3cBn7LOAEgsI61aGzfFmps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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