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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b2307961517bb11450cb546a60abb84be966c57039b322d1dd3cdd85d84a99' 
  AND token = 'aB+Rcskcp6hI2hjV7S7/rasE6e4NQNZMphJG+4OEdLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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