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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8194a5f88b5d13539fe7f57f1ab2e020e886d3903c3ec694a1ce84ad90df19' 
  AND token = '5+Ab4VctSfR8XGS8wvhFWFB4iQHThvEIsrQ3lIq72xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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