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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cd5f9da1071a26d3adeb628ca52bf15d01c94ebc4f73bd97b4526177ef2d95' 
  AND token = 'xkjkUiLCQhP3N2D/Y7Po5KjCMNcZWf8juYazugeaT1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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