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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3e236b3d14bc657f99a11b9073fa14823ececb229d7a781c42f8e87e2a1b2b' 
  AND token = '3/yYjWO0nzlNHlKOvGywmdqq1RtwbluZutsXI20nCGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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