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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb92a9faa2ca20eced059ba71ead44634543e2ad560cecb67b510d97aa101b9' 
  AND token = 'EdaChEsjyo5A2S8nmnyrJYcaaY1c3ARZaI8C8F/cYw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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