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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae601994093ea636c2e11b5e5f23ed351cfcfa29c64e5b7cf16896f85fd54989' 
  AND token = 'jszfsnpd00vWr0bRbha8z6afZa1Ynv48YKMJyGS9PZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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