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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf46117efbc2603a76d0dce85887339d40d724a03504a22538cd2e7811df7f9' 
  AND token = 'bTrBLJK05rTo8NQp4l3rFRk2ZgnoXnUwULpC+cjpHWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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