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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8a4f1a6f15613bf110e197c8bbcbc2cff3d1c4e26c607aca80e309cd0a0763' 
  AND token = 'CrDpDB+8ybZyhAm7G9gLaGfwMT4I9hH4/7AA0uJbiIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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