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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f901be1a79e3e9f9f1a11457ac43ccb50eb7e56e886e1adb7f08433a58476fef' 
  AND token = 'q1VwHaXljD0claaAYAbjCQ+ys/Y1K5j+68LnkmTkC3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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