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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e5a3f0c773dcaece5f7171c6d3bb07fe11f67b7df3570442bb777b26bce35a' 
  AND token = '0Bwpb10TQpA9//EvTPvl99w/MNN6BAnpbKxma3Gf+p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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