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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc352c4f827d6dab4ba62fb7ca357bb357f9699eaee1ce31a9ef5fff18a3dcb' 
  AND token = 'QgDxWgU0Qv51aPV+DhrEkzwAijWG4u/Rv0aza85iGM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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