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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07b38b7da8c76b50fbc8185e5d4869665c75a9971b33324dd6a50d00b1b4457' 
  AND token = 'Zb76S0uMH1Q9Sa2i+BSeMXAPgQny+sx9c2qHJVx2TEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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