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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cc737d3dd92a03a9fde20d2a0f1e03e6facd747c34f88d1a26abd1e7235508' 
  AND token = '9KWdeVHPn5Ph5ojpevtN4DxWZL2mAZGEl1z7mq+BUBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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