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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ecebc15311f997616fe0013c49859e8146469cb72d78c45722024855b9c0d0' 
  AND token = 'Sg7u53qxjpsRGazG2DWmhPhj/OgxoN8t48iaYn+4ad4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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