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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15563a736a88721c06f75d8f7538e0e84388d18ed4022ec37efe82c8b7055b39' 
  AND token = 'IAHMRxlJDBQsd6EzGRSJ3MZiRMOPoc4WBSmajD/Pbpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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