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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cb6b457607c3b286035c0e0607d7bf452b3c71d20f213698acf1dbc997d989' 
  AND token = 'FJz9v2FNq9QL7kF/Wtt3fGoeJ+XEobm1DM7cisN/1kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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