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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802a4a8b237ba60f45dfabdf948d56979b1671abfef5a12c70111f57d93dd0d5' 
  AND token = 'zM5hkl1cYPILlpwHTfiDV1M1QSLX3Vp7x8rAvk8xA8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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