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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c603abde052de41ca702b940f598121cf42e0c9da89fa7666ce2d413cac5e2' 
  AND token = '1V2QpW+sdCudMqY97oPaR8lJ0zYPhWepXY4TT2DXhkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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