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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33396cf24237854a43a6ee0851114eb9f344a0cf55d1c5fd550a55d3f582bc15' 
  AND token = 'xfBnM5abbrMG1N4aAzqyi3tbkK4FOVa1K3ja5bkEUuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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