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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbea62abfb2c5e2ff16018a923e40353e1169b7f0734b6ce9c8bdcf8599a6690' 
  AND token = '2+/RBMUULPOMieGKiECFHh9Aab2oCY+Q2oNTGK+Uhmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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